Dendragapus obscurus

Taxobox
name = Dusky Grouse
status = LC | status_system = IUCN3.1
status_ref = [IUCN2006|assessors=BirdLife International|year=2004|id=47080|title=Dendragapus obscurus|downloaded=11 May 2006 Database entry includes justification for why this species is of least concern]

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image_width = 240px
image_caption = Male Dusky Grouse displaying, Yellowstone
regnum = Animalia
phylum = Chordata
classis = Aves
ordo = Galliformes
familia = Tetraonidae
genus = "Dendragapus"
species = "D. obscurus"
binomial = "Dendragapus obscurus"
binomial_authority = The Dusky Grouse, "Dendragapus obscurus", is a species of forest-dwelling grouse native to North America's Rocky Mountains.del Hoyo, J., Elliott, A., & Sargatal, J., eds. (1994). "Handbook of the Birds of the World" 2: 401-402. Lynx Edicions, Barcelona ISBN 84-87334-15-6.] cite book | author=Sibley, D. | title=The Sibley Guide to Birds | publisher=Knopf | year=2000 | pages = 143 | id=ISBN 0-679-45122-6] It is so closely related to the Sooty Grouse, "Dendragapus fuliginosus", that until recently there was some debate whether they were separate species.

Description

Adults have a long square tail, gray at the end. Adult males are mainly dark with a purplish throat air sac surrounded by white, and a yellow to red wattle over the eye during display. Adult females are mottled brown with dark brown and white marks on the underparts.

Their breeding habitat is the edges of conifer and mixed forests in mountainous regions of western North America, from southeastern Alaska and Yukon south to New Mexico. Their range is closely associated with that of various conifers. The nest is a scrape on the ground concealed under a shrub or log.

They are permanent residents but move short distances by foot and short flights to denser forest areas in winter, with the odd habit of moving to higher altitudes in winter.

These birds forage on the ground, or in trees in winter. In winter, they mainly eat fir and douglas-fir needles, occasionally also hemlock and pine needles; in summer, other green plants ("Pteridium, Salix"), berries ("Gaultheria, Mahonia, Rubus, Vaccinium"), and insects (particularly ants, beetles, grasshoppers) are more important. Chicks are almost entirely dependent on insect food for their first ten days.

Males sing with deep hoots on their territory and make short flapping flights to attract females. Females leave the male's territory after mating.

References

External links

* [http://vireo.acnatsci.org/search.html?Form=Search&SEARCHBY=Scientific&KEYWORDS=dendragapus+obscurus&showwhat=images&AGE=All&SEX=All&ACT=All&Search=Search&VIEW=All&ORIENTATION=All&RESULTS=24 Dusky Grouse photo gallery] VIREO